CN106675658A - Device and method for high-flux circulating fluidized bed low-rank coal gasifying - Google Patents
Device and method for high-flux circulating fluidized bed low-rank coal gasifying Download PDFInfo
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- CN106675658A CN106675658A CN201611160553.9A CN201611160553A CN106675658A CN 106675658 A CN106675658 A CN 106675658A CN 201611160553 A CN201611160553 A CN 201611160553A CN 106675658 A CN106675658 A CN 106675658A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
- C10J3/56—Apparatus; Plants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
- C10J3/60—Processes
- C10J3/64—Processes with decomposition of the distillation products
- C10J3/66—Processes with decomposition of the distillation products by introducing them into the gasification zone
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0903—Feed preparation
- C10J2300/0906—Physical processes, e.g. shredding, comminuting, chopping, sorting
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0903—Feed preparation
- C10J2300/0909—Drying
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0973—Water
- C10J2300/0976—Water as steam
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1625—Integration of gasification processes with another plant or parts within the plant with solids treatment
- C10J2300/1628—Ash post-treatment
Abstract
The invention discloses a device and a method for high-flux circulating fluidized bed low-rank coal gasifying, and belongs to the field of clean utilization of coal. The coal gasifying reaction device consists of a jet flow enhanced bottom ash separation area, a low-rank coal strong mixed pyrolysis, gasifying and combustion area, a residual carbon lifting pipe deep gasifying area, a two-stage cyclone separator and a material return mechanism. The coal gasifying method is characterized in that the lifting pipe gasifying area is directly connected by a secondary material return mechanism at higher air speed, the deep gasifying of residual carbon in fine ash is realized under the high flux condition, and the high-efficiency separation of bottom ash is realized by a high-speed jet flow pipe and a separation column coupling structure. The low-rank coal gasifying device and the method have the advantages that the carbon conversion rate is high, the gasifying strength is high, the utilization rate of device is high, the ash discharging is easy, and the device and method are especially suitable for improving the quality of low-rank coals, such as lignite.
Description
Technical field
The invention belongs to clean coal utilization apparatus field, more particularly to a kind of high flux recirculating fluidized bed low order coal gas
Change device and method.
Background technology
The endowment of resources of " few gas rich in coal and poor in oil " determines that coal in a foreseeable future remains the important basis of China
The energy, wherein gasification technology are one of important channels of Coal Clean efficient utilization.It is reported that, China with brown coal and jet coal is
Main low-order coal accounts for the 45% of remaining coal recoverable reserves, but " two high three is low " of the low-order coal such as brown coal (volatile matters are high, moisture
It is high, ash fusion point is low, density is low, calorific value is low) feature causes its serious environment pollution, it is difficult to obtain on a large scale using shortcoming, therefore,
Exploitation low order coal gasification technology is to realize clean conversion of energy source and the important support for utilizing and guarantee.
Business-like Coal Gasification Technology can be divided into three kinds of fixed bed, air flow bed and fluid bed.Wherein, fixed bed gas
Change with weak bonding lump coal as raw material, methane content height, cold gas efficiency are high in coal gas, be particularly suitable for natural gas from coal, but it is burnt
Oily waste water purification system is relative complex；Air flow bed is operated at high temperature, and the intensity of gasification and synthesis gas quality are higher, but generally with low
The coal dust of ash is raw material, while oxygen consumption and equipment investment are higher；Fluidized gasification with small-particle coal as raw material, gas-solid contact face
Product is relatively large, and reaction temperature is moderate, and oxygen consumption is low, invests low, is particularly suitable for the high brown coal of reactivity and jet coal etc. low
Rank coal.Therefore, exploitation is suitable for a fluidized gasification technology undoubtedly highly important job of low-order coal.
Existing fluidized gasification technology can run into following difficulty unavoidably when the low-order coals such as brown coal, jet coal are gasified：1.
Charcoal percent conversion relatively low (90% or so)；2. the intensity of gasification is relatively low；3. bottom ash discharge is difficult.
The content of the invention
It is an object of the invention to provide a kind of high flux recirculating fluidized bed Low-order coal gasification unit and method, it is characterised in that
The high flux recirculating fluidized bed Low-order coal gasification unit mainly includes jet strengthened bottom ash Disengagement zone A, low-order coal
Strong mixed pyrolysis, gasification, combustion zone B, carbon residue riser depth gasification zone C, two stage cyclone separator and Loop Seal.
Described jet strengthened bottom ash Disengagement zone A is by V-type gas distribution grid 1, V-type distribution grid air chamber 2, distribution grid air inlet pipe
3rd, central jet pipe 4, fluidisation detached dowel 5, slag-drip opening 6 and detached dowel air inlet 7 are constituted；Wherein V-type gas distribution grid 1 is located at V
The top of type distribution grid air chamber 2, in funnel-form, is dispersed with gas outlet on V-type distribution grid 1, bottom is connected with fluidisation detached dowel 5
Connect；Plate air inlet pipe 3 is distributed in V-type distribution grid air chamber 2；Central jet pipe 4 is located on the axis of fluidisation detached dowel 5；Stream
The bottom for changing detached dowel 5 is connected with slag-drip opening 6, and its bottom is provided with detached dowel air inlet 7；
The strong mixed pyrolysis of described low-order coal, gasification, combustion zone B and carbon residue riser depth gasification zone C are fluid bed gas
Change the main part of stove, the strong mixed pyrolysis of low-order coal, gasification, combustion zone B are located at jet strengthened bottom ash Disengagement zone A and carbon residue lifting
Between pipe depth gasification zone C, in the strong mixed pyrolysis of low-order coal, gasification, combustion zone B and carbon residue riser depth gasification zone C under
And on have primary cycle ash returning charge unit 8, as-fired coal feed pipe 9, gasifying agent air inlet pipe 10, secondary cycle ash returning charge unit successively
11, wherein in the middle part of the strong mixed pyrolysis of low-order coal, gasification, combustion zone B, gasifying agent air inlet pipe 10 is located at as-fired coal feed pipe 9
The strong mixed pyrolysis of low-order coal, gasification, combustion zone B tops；Secondary cycle ash returning charge unit 11 is connected to carbon residue riser depth gas
Change area C bottoms.
Described two stage cyclone separator and Loop Seal are the supply unit of circulating ash, primary cyclone 13 and gas
Change stove top export 12 to be connected by pipeline, its lower end is sequentially connected primary cycle standpipe 14, U-shaped valve 15, primary cycle ash and returns
Material unit 8, then returnes to the strong mixed pyrolysis of low-order coal, gasification, combustion zone B；The air vent Jing pipes of primary cyclone 13
Road is connected with secondary cyclone 16, and 16 top of secondary cyclone is syngas outlet 17, and lower end is connected with two grades and follows
Ring standpipe 18, secondary cycle ash returning charge unit 11, eventually returns to carbon residue riser depth gasification zone C bottoms.
Described carbon residue riser depth gasification zone C and the strong mixed pyrolysis of low-order coal, gasification, the ratio of combustion zone B-section product
For 0.5:1--0.75:1.
Loosening wind air inlet pipe 19 and conveying wind air inlet pipe 20 are provided with described secondary cycle ash returning charge unit 11, realizing should
The lock gas material feeding function of unit.A kind of Low-rank coal gasification method of high flux recirculating fluidized bed Low-order coal gasification unit, its feature
Be carbon residue riser depth gasification zone C to be directly connected to by high-speed jet gas and two grades of Loop Seals, realize residual in fine ash
Depth gasification of the charcoal under high throughput conditions；High-speed jet gas is introduced in gasification furnace bottom, after promoting bottom ash melting balling-up, Jing
Detached dowel high efficiency separation；Comprise the steps：
Moisture is less than into 10wt% and granularity gasification furnace is continuously added to by feed pipe 9 less than the as-fired coal of 15mm, while
The distribution grid air inlet pipe 3 of jet strengthened bottom ash Disengagement zone A of gasification furnace bottom, central jet pipe 4 and detached dowel air inlet 7 are continuous
Air is passed through, low-order coal ruptures first or is pyrolyzed, then part occurs gasification or combustion reaction, generates the less high temperature of particle diameter half
Burnt to enter riser gasification zone C under air-flow entrainment, the gasifying agent constituted with oxygen and water vapour is reacted；Top of gasification furnace
The solid particle Jing two stage cyclones separator taken out of and Loop Seal successively return to gasification furnace, and the wherein larger granule of particle diameter exists
After primary cyclone 13 realizes gas solid separation, strong mixed pyrolysis, gasification, burning are sent into by primary cycle ash returning charge unit 8
Area B, by further gasification, burning；The less granule of particle diameter then Jing secondary cyclones 16 and secondary cycle ash returning charge unit
11 enter riser gasification zone C, and the carbon residue in little particle realizes that effective depth gasifies, and low-order coal integrated gasification efficiency is carried
It is high；Syngas outlet 17 on 16 top of secondary cyclone obtains the extremely low high-quality synthesis gas of dust content.
It is described in jet strengthened bottom ash Disengagement zone A, bottom ash is realized using high-speed jet pipe and detached dowel coupled structure
High efficiency separation；Air and oxygen are introduced by central jet pipe 4, are formed about high temperature combustion zone in efflux nozzle, promote lime-ash group
It is polymerized to ball；Air is passed through in V-type gas distribution grid 1 makes bed maintain fluidized state, and then the sky being passed through by detached dowel air inlet 7
Gas separates the beds such as ash group and semicoke under suitable gas speed, and then ash group discharges gasification furnace；Bed drain purge can be by adjustment
Detached dowel gas speed is controlled with central jet pipe outlet height is adjusted.
Beneficial effects of the present invention：Have the advantage that compared with prior art：
(1) the coal and semicoke of fully gasification is not repeatedly circulated in gasification furnace, increases the time of staying, is effectively improved carbon and is turned
Rate；
(2) circle fluidized-bed gasification furnace is operated under high throughput conditions, and device disposal ability and the intensity of gasification are obviously improved；
(3) using high-speed jet pipe and detached dowel coupled structure, a difficult problem for bottom ash discharge is solved, is particularly suitable for ash and contains
The higher low-order coal of amount.
Description of the drawings
Fig. 1 is the schematic device of high flux recirculating fluidized bed low order coal gasification of the present invention.
As illustrated, 1-V type gas distribution grids, 2-V type distribution grid air chambers, 3- distribution grid air inlet pipe, 4- central jet pipes,
5- fluidizes detached dowel, 6- slag-drip openings, 7- detached dowel air inlets, 8- primary cycles ash returning charge unit, 9- as-fired coal feed pipes, 10-
Gasifying agent air inlet pipe, 11- secondary cycles ash returning charge unit, 12- gasification outlet of stills, 13- primary cyclones, 14- one-levels are followed
Ring standpipe, 15-U type valves, 16- secondary cyclones, 17- syngas outlets, 18- secondary cycle standpipes, 19- loosen wind air inlet
Pipe, 20- conveying wind air inlet pipe；The jet strengthened bottom ash Disengagement zone of A-, the strong mixed pyrolysis of B- low-order coals/gasification/burn area, C- carbon residues
Riser depth gasification zone.
Specific embodiment
The present invention proposes a kind of high flux recirculating fluidized bed Low-order coal gasification unit and method, below in conjunction with the accompanying drawings and gives
Further illustrate.
Fig. 1 show high flux recirculating fluidized bed Low-order coal gasification unit.The device is mainly separated by jet strengthened bottom ash
Area A, the strong mixed pyrolysis of low-order coal, gasification, combustion zone B, carbon residue riser depth gasification zone C, two stage cyclone separator and returning charge
Mechanism constitutes.
Jet strengthened bottom ash Disengagement zone A is by V-type gas distribution grid 1, V-type distribution grid air chamber 2, distribution grid air inlet pipe 3, center
Jet pipe 4, fluidisation detached dowel 5, slag-drip opening 6 and detached dowel air inlet 7 are constituted.Wherein V-type gas distribution grid 1 is distributed positioned at V-type
The top of plate air chamber 2, in funnel-form, is dispersed with gas outlet on V-type distribution grid 1, bottom is connected with fluidisation detached dowel 5；In V-type
Plate air inlet pipe 3 is distributed in distribution grid air chamber 2；Central jet pipe 4 is located on the axis of fluidisation detached dowel 5, central jet pipe 4
Outlet is contour with the bottom of V-type gas distribution grid 1.
The bottom of fluidisation detached dowel 5 is connected with slag-drip opening 6, and its bottom is provided with detached dowel air inlet 7.The strong heat of mixing of low-order coal
Solution, gasification, combustion zone B and carbon residue riser depth gasification zone C be fluidized-bed gasification furnace main part, the strong heat of mixing of low-order coal
Solution, gasification, combustion zone B are located between jet strengthened bottom ash Disengagement zone A and carbon residue riser depth gasification zone C, and wherein carbon residue is carried
Riser depth gasification zone C is 0.5 with the ratio of the strong mixed pyrolysis of low-order coal, gasification, combustion zone B-section product:1.Mixed in low-order coal by force
Conjunction is pyrolyzed, gasifies, combustion zone B and carbon residue riser depth gasification zone C has primary cycle ash returning charge unit 8 from bottom to top successively,
As-fired coal feed pipe 9, gasifying agent air inlet pipe 10, secondary cycle ash returning charge unit 11, wherein as-fired coal feed pipe 9 is located at low-order coal
Strong mixed pyrolysis, gasification, in the middle part of the B of combustion zone, gasifying agent air inlet pipe 10 is on the strong mixed pyrolysis of low-order coal, gasification, combustion zone B
Portion；Secondary cycle ash returning charge unit 11 connects carbon residue riser depth gasification zone C bottoms.Two stage cyclone separator and Loop Seal
It is the supply unit of circulating ash, primary cyclone 13 is connected by pipeline with gasification furnace top export 12, and its lower end is successively
Connection primary cycle standpipe 14, U-shaped valve 15, primary cycle ash returning charge unit 8, the low-order coal for then returning to gasification furnace mixes by force
Pyrolysis, gasification, combustion zone B；The air vent Jing pipelines of primary cyclone 13 are connected with secondary cyclone 16, two grades of rotations
16 top of wind separator is syngas outlet 17, and lower end is connected with secondary cycle standpipe 18, secondary cycle ash returning charge unit 11, most
Carbon residue riser depth gasification zone C bottoms are back to eventually.19 He of loosening wind air inlet pipe is provided with secondary cycle ash returning charge unit 11
Conveying wind air inlet pipe 20, realizes the lock gas material feeding function of the unit.
Embodiment 1
In the present embodiment, carbon residue riser depth gasification zone C is accumulated with the strong mixed pyrolysis of low-order coal, gasification, combustion zone B-section
Ratio be 0.5:1, the outlet of central jet pipe 4 is contour with the bottom of V-type gas distribution grid 1.
Eastern brown coal will be covered and send into pulverized coal preparation system, Jing after coal-grinding crusher machine and exsiccator are dried so as to meet granularity and be less than
15mm, moisture are less than 10wt%；The strong mixed pyrolysis of as-fired coal Jing low-order coals, gasification, the as-fired coal feed pipe 9 in the middle part of the B of combustion zone
It is continuously added to, while in the distribution grid air inlet pipe 3 of gasification furnace bottom, central jet pipe 4, detached dowel air inlet 7 are continuously passed through sky
Gas, low-order coal rupture first or are pyrolyzed, and then part occurs gasification or combustion reaction, generate the less high-temperature semi-coke of particle diameter in gas
Stream entrainment is lower into riser gasification zone C；The gasifying agent of oxygen and water vapour composition is injected by gasifying agent air inlet pipe 10, with lifting
There is gasification reaction upwards in the high-temperature semi-coke granule cocurrent in pipe；The temperature control of riser gasification zone C is maintained 850~1000
℃.The gas-solid reaction occurred in the strong mixed pyrolysis of low-order coal, gasification, combustion zone B mainly includes：Pyrolysis of coal is reacted：Coal→C
+H2+CH4+H2O+CO2+ CO, etc.The independent reaction of carbon residue riser depth gasification zone C coal gasification courses has：C+O2→ CO, C+
O2→CO2, C+CO2→ CO, C+H2O→CO+H2, C+H2→CH4, CO+H2O→H2+CO2.Gasifying agent 10 and the furnace bottom that gasifies
Each air inlet maintains suitable operating gas velocity, makes higher solids flux is obtained in riser.
The synthesis gas Jing gasification outlet of stills 12 that gasification is generated enter primary cyclone 13, and primary cyclone 13 is caught
The solid particle such as grey, burnt of gas entrained with is assembled, most solid particles fall into U-shaped valve by primary cycle standpipe 14
15, the strong mixed pyrolysis of low-order coal, gasification, combustion zone B bottoms are sent into by primary cycle ash returning charge unit 8；Thin of its small portion
The air vent of grain Jing primary cyclones 13 enters secondary cyclone 16, Jing after secondary cyclone 16 is captured, carefully
Granule falls into secondary cycle standpipe 18, and the secondary cycle ash returning charge unit 11 that Jing has lock gas material feeding function is sent to riser gas
Change area C bottoms；The solid particle for being sent back to gasification furnace participates in reacting and circulating again, finally on 16 top of secondary cyclone
Syngas outlet 17 obtain the extremely low high-quality synthesis gas of dust content.
In jet strengthened bottom ash Disengagement zone A, air, oxygen are introduced by central jet pipe 4, are formed about in efflux nozzle
1100~1300 DEG C of high-temp combustion region promotes lime-ash reunion balling-up；Air is passed through in V-type gas distribution grid 1 maintains bed
Fluidized state, and then the air being passed through by detached dowel air inlet 7 separates the beds such as grey ball and semicoke under suitable gas speed, so
Grey ball discharges gasification furnace afterwards.Bed drain purge can be controlled with central jet pipe outlet height is adjusted by adjusting detached dowel gas speed
System.
Embodiment 2：
Riser gasification zone C is 0.75 with the ratio of strong mixed pyrolysis, gasification, combustion zone B-section product:1；Central jet pipe 4
Outlet is slightly above the bottom of V-type gas distribution grid 1.Remaining device is identical with the device in embodiment 1.
In this example, Fuxin jet coal is sent into into pulverized coal preparation system, Jing after coal-grinding crusher machine and exsiccator are dried so as to meet
Granularity is less than 15mm, and moisture is less than 10wt%；As-fired coal in the middle part of the strong mixed pyrolysis of as-fired coal Jing low-order coals/gasification/burn area B
Feed pipe 9 is continuously added to, while the distribution grid air inlet pipe 3, central jet pipe 4, detached dowel air inlet 7 in gasification furnace bottom is continuous
Air is passed through, low-order coal ruptures first or is pyrolyzed, then part occurs gasification or combustion reaction, generates the less high temperature of particle diameter half
It is burnt to enter riser gasification zone C under air-flow entrainment；The gasifying agent of the composition of oxygen and water vapour is by 10 note of gasifying agent air inlet pipe
Enter, gasification reaction occurs upwards with the high-temperature semi-coke granule cocurrent in riser；The temperature control of riser gasification zone C is maintained to exist
900~1050 DEG C.The gas-solid reaction occurred in the strong mixed pyrolysis of low-order coal/gasification/burn area B mainly includes：Pyrolysis of coal is anti-
Should：Coal→C+H2+CH4+H2O+CO2+ CO, etc.The independent reaction of carbon residue riser depth gasification zone C coal gasification courses has：C
+O2→ CO, C+O2→CO2, C+CO2→ CO, C+H2O→CO+H2, C+H2→CH4, CO+H2O→H2+CO2.Gasifying agent 10 and gas
Each air inlet for changing furnace bottom maintains suitable operating gas velocity, makes higher solids flux is obtained in riser.
The synthesis gas Jing gasification outlet of stills 12 that gasification is generated enter primary cyclone 13, and primary cyclone 13 is caught
The solid particles such as ash/Jiao of gas entrained with are assembled, most solid particles fall into U-shaped valve by primary cycle standpipe 14
15, the strong mixed pyrolysis of low-order coal, gasification, combustion zone B bottoms are sent into by primary cycle ash returning charge unit 8；Thin of its small portion
The air vent of grain Jing primary cyclones 13 enters secondary cyclone 16, Jing after secondary cyclone 16 is captured, carefully
Granule falls into secondary cycle standpipe 18, and the secondary cycle ash returning charge unit 11 that Jing has lock gas material feeding function is sent to riser gas
Change area C bottoms；The solid particle for being sent back to gasification furnace participates in reacting and circulating again.Finally on 16 top of secondary cyclone
Syngas outlet 17 obtain the extremely low high-quality synthesis gas of dust content.
In jet strengthened bottom ash Disengagement zone A, air/oxygen is introduced by central jet pipe 4, is formed about in efflux nozzle
1100~1300 DEG C of high-temp combustion region promotes lime-ash reunion balling-up；Air is passed through in V-type gas distribution grid 1 maintains bed
Fluidized state, and then the air being passed through by detached dowel air inlet 7 separates the beds such as grey ball and semicoke under suitable gas speed, so
Grey ball discharges gasification furnace afterwards.Bed drain purge can be controlled with central jet pipe outlet height is adjusted by adjusting detached dowel gas speed
System.
Claims (5)
1. a kind of high flux recirculating fluidized bed Low-order coal gasification unit, it is characterised in that the high flux recirculating fluidized bed low order
Coal gasification apparatus mainly include jet strengthened bottom ash Disengagement zone (A), the strong mixed pyrolysis of low-order coal, gasification, combustion zone (B), carbon residue
Riser depth gasification zone (C), two stage cyclone separator and Loop Seal；
Described jet strengthened bottom ash Disengagement zone (A) is by V-type gas distribution grid (1), V-type distribution grid air chamber (2), distribution grid air inlet
Pipe (3), central jet pipe (4), fluidisation detached dowel (5), slag-drip opening (6) and detached dowel air inlet (7) are constituted；Wherein V-type gas
Positioned at the top of V-type distribution grid air chamber (2), in funnel-form, V-type distribution grid is dispersed with gas outlet on (1) to distribution grid (1), under
Portion is connected with fluidisation detached dowel (5)；Plate air inlet pipe (3) is distributed in V-type distribution grid air chamber (2)；Central jet pipe (4) is located at
On the axis of fluidisation detached dowel (5)；The bottom of fluidisation detached dowel (5) is connected with slag-drip opening (6), and its bottom is provided with detached dowel and enters
QI KOU (7)；
The strong mixed pyrolysis of described low-order coal, gasification, combustion zone (B) and carbon residue riser depth gasification zone (C) are fluid bed gas
Change the main part of stove, the strong mixed pyrolysis of low-order coal, gasification, combustion zone (B) are positioned at jet strengthened bottom ash Disengagement zone (A) and carbon residue
Between riser depth gasification zone (C), gasify in the strong mixed pyrolysis of low-order coal, gasification, combustion zone (B) and carbon residue riser depth
Area (C) have successively from bottom to top primary cycle ash returning charge unit (8), as-fired coal feed pipe (9), gasifying agent air inlet pipe (10), two
Level circulating ash returning charge unit (11), wherein as-fired coal feed pipe (9) is in the strong mixed pyrolysis of low-order coal, gasification, combustion zone (B)
Portion, gasifying agent air inlet pipe (10) is positioned at the strong mixed pyrolysis of low-order coal, gasification, combustion zone (B) top；Secondary cycle ash returning charge unit
(11) it is connected to carbon residue riser depth gasification zone (C) bottom；
Described two stage cyclone separator and Loop Seal are the supply unit of circulating ash, primary cyclone (13) and gasification
Stove top export (12) is connected by pipeline, and its lower end is sequentially connected primary cycle standpipe (14), U-shaped valve (15), primary cycle
Grey returning charge unit (8), then returnes to the strong mixed pyrolysis of low-order coal, gasification, combustion zone (B)；Primary cyclone (13)
Air vent Jing pipelines are connected with secondary cyclone (16), and secondary cyclone (16) top is syngas outlet (17),
Lower end is connected with secondary cycle standpipe (18), secondary cycle ash returning charge unit (11), eventually returns to carbon residue riser depth gas
Change area (C) bottom.
2. a kind of high flux recirculating fluidized bed Low-order coal gasification unit according to claim 1, it is characterised in that described
Carbon residue riser depth gasification zone (C) is 0.5 with the ratio of the strong mixed pyrolysis of low-order coal, gasification, combustion zone (B) sectional area:1--
0.75:1。
3. a kind of high flux recirculating fluidized bed Low-order coal gasification unit according to claim 1, it is characterised in that described
Loosening wind air inlet pipe (19) and conveying wind air inlet pipe (20) are provided with secondary cycle ash returning charge unit (11), the lock of the unit is realized
Gas material feeding function.
4. a kind of Low-rank coal gasification method of high flux recirculating fluidized bed Low-order coal gasification unit, it is characterised in that by high rapid fire
Gas body and two grades of Loop Seals are directly connected to carbon residue riser depth gasification zone (C), and in realizing fine ash, carbon residue is in high flux bar
Depth gasification under part；High-speed jet gas is introduced in gasification furnace bottom, after promoting bottom ash melting balling-up, separated pillar height effect point
From；Comprise the steps：
Moisture is less than into 10wt% and granularity gasification furnace is continuously added to by feed pipe (9) less than the as-fired coal of 15mm, while in gas
Change distribution grid air inlet pipe (3), central jet pipe (4) and the detached dowel air inlet of the jet strengthened bottom ash Disengagement zone (A) of furnace bottom
(7) air is continuously passed through, low-order coal ruptures first or is pyrolyzed, then part occurs gasification or combustion reaction, generates particle diameter less
High-temperature semi-coke enter riser gasification zone (C) under air-flow entrainment, the gasifying agent constituted with oxygen and water vapour is reacted；
Solid particle Jing two stage cyclones separator that top of gasification furnace is taken out of and Loop Seal successively return to gasification furnace, wherein particle diameter compared with
Big granule sends into strong mixing by primary cycle ash returning charge unit (8) after primary cyclone (13) realizes gas solid separation
Pyrolysis, gasification, combustion zone (B), by further gasification, burning；The less granule of particle diameter then Jing secondary cyclones (16) and
Into riser gasification zone (C), the carbon residue in little particle realizes that effective depth gasifies to secondary cycle ash returning charge unit (11), low order
Coal integrated gasification efficiency is improved；It is dense that the final syngas outlet (17) on secondary cyclone (16) top obtains dust-laden
The extremely low high-quality synthesis gas of degree.
5. a kind of Low-rank coal gasification method of high flux recirculating fluidized bed Low-order coal gasification unit according to claim 1, its
It is characterised by, it is described in jet strengthened bottom ash Disengagement zone (A), bottom ash is realized using high-speed jet pipe and detached dowel coupled structure
High efficiency separation；Air and oxygen are introduced by central jet pipe (4), are formed about high temperature combustion zone in efflux nozzle, are promoted ash
Slag reunion balling-up；Air is passed through in V-type gas distribution grid (1) makes bed maintain fluidized state, and then by detached dowel air inlet (7)
The air being passed through separates the beds such as ash group and semicoke under suitable gas speed, and then ash group discharges gasification furnace；Bed drain purge passes through
Adjustment detached dowel gas speed is controlled with central jet pipe outlet height is adjusted.
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